Pure crop 1?

Got PM late into flower, week 6 right now. The guy at the hydro store told me pure crop1 is completely safe to spray till harvest, even added that it is actually beneficial for the plant because it is a biostimulant. Last time around I got PM this late into flower I used grow safe and notice a significant decrease in yield and also lots of long brown hairs. Can anyone call this guys bs or is this true?
 

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